- Santiago is a close friend of director Guillermo del Toro. He appears in most of del Toro's American films in cameo bit parts and is a frequent collaborator on many of del Toro's projects.
- Well-known for appearing as a guest in almost every successful TV show in Spain to promote his "Torrente" films.
- He used to take part in TV shows and contests in order to earn money for making his first short films.
- Has two daughters with María Amaro. The first child, named Calma, was born on February 7, 2008. The second one, named Sirena, was born on December, 2013.
- He dubbed in Spanish the following characters:
- Mikey Forrester (Irvine Welsh) in Trainspotting (1996)
- The Narrator (Alan Ford) in Lock, Stock and Two Smoking Barrels (1998)
- Sullivan (John Goodman) in Monsters, Inc. (2001)
- Max Bialystock (Nathan Lane) in The Producers (2005)
- Johann Krauss (Seth MacFarlane) in Hellboy II: The Golden Army (2008)
- Brennan Huff (Will Ferrell) and Step Brothers (2008).
- Spent the 1982-1983 school year as an AFS student at Dobbs Ferry High School in Dobbs Ferry, NY.
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